Wednesday, July 29, 2009

RIDDLE
Brain Teaser
CIRCLES
  • A circle is the set of all those points, say P, in a plane, each of which is at a constant distance from a fixed point in that plane.
    The fixed point is called the center and the constant distance is called the radius.
    All radii of a circle are equal.


  • A line segment joining any two points of a circle is called a chord of the circle.
    A chord of a circle passing through its center is called a diameter of the circle
  • Length of diameter = 2 × radius

Exercise.
1. Fill in the blanks with correct word(s) to make the statement true:

(i) Radius of a circle is one-half of its.....

(ii) A radius of a circle is a line segment with one end point at..... and the other end on.....

(iii) A chord of a circle is a line segment with its end points....

(iv) A diameter of a circle is a chord that..... the center of the circle.

(v) All radii of a circle are.....

2. State which of the following statements are true and which are false:
(i) A line segment with its end-points lying on a circle is called a diameter of the circle.
(ii) Diameter is the longest chord of the circle.
(iii) The end-points of a diameter of a circle divide the circle into two parts; each part is called a semi-circle.
(iv) A diameter of a circle divides the circular region into two parts; each part is called a semi-circular region.
(v) The diameters of a circle are concurrent. The center of the circle is the point common to all diameters.
(vi) Every circle has unique center and it lies inside the circle.
(vii) Every circle has unique diameter.

Tuesday, July 7, 2009

Maths Challenge 2
7th July- 17th July
Each letter stands for a digit from 0 to 9. No two digits have the same letter code and each letter corresponds to a distinct digit. Discover the code so that the problems become true.
1. T H R E E + T H R E E + F O U R = E L E V E N
2. A B C D E x 4 = E D C B A
3. WRONG + WRONG = R I G H T
Maths Challenge 1
Answers:
1.

2. 58 years
3. 179

Friday, July 3, 2009

Maths Jokes

Teacher: What is 2k + k?
Student: 3000!
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Teacher: "Who can tell me what 7 times 6 is?"
Student: "It's 42!"
Teacher: "Very good! - And who can tell me what 6 times 7 is?"
Same student: "It's 24!"

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What is "pi"?

Mathematician: Pi is the ratio of the circumference of a circle to its diameter.

Engineer: Pi is about 22/7.

Physicist: Pi is 3.14159 plus or minus 0.000005

Computer Programmer: Pi is 3.141592653589 in double precision.

Nutritionist: You one track math-minded fellows, Pie is a healthy and delicious dessert!